I just got my invitation to buy a Chumby. I've been interested in these things since I first heard about them, and the store is still invitation-only.
Basically, it's a little arm-based linux computer with a wifi connection, some usb ports, speakers, etc, in a little soft ball-like form factor. Runs flash widgets. Very hackable.
Except it's $180. I'm not yet quite sure I want it THAT much. Looking thru the example widgets, I'm not highly impressed yet, tho there are some cute ones. Looking at the wiki however, at what's been made available to make developing for it easy, I'm tempted.